[Python-ideas] A real limitation of contextlib.nested()

[Georg Brandl]

Ron Adam schrieb:
> 
> Nick Coghlan wrote:
> 
>> Dedicated syntax (such as the form that Christian proposed) would fix
>> this problem:
>> 
>>   with lock, (open(infile) as fin), (open(outfile, 'w') as fout):
>>       fout.write(fin.read())
> 
> Could 'and' possibly be used sense it is a flow control operator in python.
> 
>     with lock
>            and open(infile) as fin
>            and open(outfile, 'w' as fout:
>        fout.write(fin.read())

But it isn't a control flow operator. It is a boolean operator, and since
"with" expressions are expressions, it's perfectly valid there.

Georg

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